/* ============================================================
   乐鱼看台 / 共享外壳样式  /assets/site.css
   夜间看台信号系统：深海蓝底 + 青橙信号 + 靛紫/酒红有机分区
   ============================================================ */

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body,
h1, h2, h3, h4, h5, p,
ul, ol, li, dl, dd,
figure, blockquote { margin: 0; }

ul, ol { padding: 0; list-style: none; }

img, svg, video, picture { display: block; max-width: 100%; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

/* ---------- 变量 ---------- */
:root {
  --deep-sea: #061C2F;
  --night-blue: #0B2B45;
  --indigo: #2B1B4A;
  --wine: #5A1F33;
  --signal-cyan: #37F5D4;
  --signal-orange: #FF7A2F;
  --rank-up: #32D583;
  --rank-down: #FF5A6E;
  --mist: #EAF6F7;
  --steel: #7FA2B2;

  --ink-80: rgba(234, 246, 247, 0.82);
  --ink-70: rgba(234, 246, 247, 0.70);
  --ink-50: rgba(234, 246, 247, 0.52);
  --line: rgba(127, 162, 178, 0.22);
  --line-strong: rgba(55, 245, 212, 0.34);

  --font-display: "Archivo Black", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-index: "Barlow Condensed", "Noto Sans SC", "PingFang SC", sans-serif;

  --header-h: 80px;
  --gutter: clamp(18px, 4vw, 52px);
  --maxw: 1360px;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;
  --ease: 160ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.01em;
  color: var(--mist);
  background-color: var(--deep-sea);
  background-image:
    radial-gradient(1200px 620px at 84% -10%, rgba(43, 27, 74, 0.78), transparent 65%),
    radial-gradient(980px 560px at 4% 8%, rgba(11, 43, 69, 0.92), transparent 70%),
    radial-gradient(760px 460px at 96% 92%, rgba(90, 31, 51, 0.42), transparent 70%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--signal-cyan);
  color: var(--deep-sea);
}

:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

/* 主内容让出固定头部高度；全幅首屏页给 main 加 .main--overlay */
#main-content {
  padding-top: var(--header-h);
  scroll-margin-top: var(--header-h);
}

#main-content.main--overlay { padding-top: 0; }

/* ---------- 通用布局 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 110px); }

.grid { display: grid; gap: clamp(16px, 2.2vw, 32px); }

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

.grid--3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }

/* ---------- 通用排版组件 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}

.display-xl {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 7vw, 104px);
  line-height: 0.94;
  letter-spacing: -0.03em;
  color: var(--mist);
}

.display-lg {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 56px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--mist);
}

.lede {
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.95;
  color: var(--ink-70);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  transition: background var(--ease), color var(--ease), border-color var(--ease), transform var(--ease);
}

.btn-sm { padding: 9px 16px; font-size: 13px; }

.btn-signal {
  background: var(--signal-orange);
  color: var(--deep-sea);
  box-shadow: 0 10px 26px -14px rgba(255, 122, 47, 0.9);
}

.btn-signal:hover,
.btn-signal:focus-visible {
  background: #ff914f;
  transform: translateY(-1px);
}

.btn-cyan { background: var(--signal-cyan); color: var(--deep-sea); }

.btn-cyan:hover,
.btn-cyan:focus-visible { background: #63ffe3; transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--mist);
  border-color: var(--line-strong);
}

.btn-ghost:hover,
.btn-ghost:focus-visible { color: var(--signal-cyan); border-color: var(--signal-cyan); }

/* ---------- 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--signal-cyan);
  color: var(--deep-sea);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  transform: translateY(-180%);
  transition: transform var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  color: var(--mist);
  background: linear-gradient(180deg, rgba(6, 28, 47, 0.94) 0%, rgba(6, 28, 47, 0.66) 64%, rgba(6, 28, 47, 0) 100%);
  border-bottom: 1px solid transparent;
  transition: background var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.site-header.is-stuck {
  background: rgba(11, 43, 69, 0.97);
  border-bottom-color: var(--line);
  box-shadow: 0 22px 44px -32px rgba(0, 0, 0, 0.95);
}

.signal-strip {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 6px;
  padding-inline: var(--gutter);
  overflow: hidden;
}

.strip-tick {
  flex: 0 0 auto;
  width: 34px;
  height: 2px;
  border-radius: 2px;
  background: rgba(127, 162, 178, 0.3);
}

.strip-tick.is-on {
  background: var(--signal-cyan);
  box-shadow: 0 0 10px rgba(55, 245, 212, 0.7);
}

.strip-tick.is-warm {
  background: var(--signal-orange);
  box-shadow: 0 0 10px rgba(255, 122, 47, 0.6);
}

.strip-track {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
  width: 100%;
  max-width: var(--maxw);
  min-height: 56px;
  margin-inline: auto;
  padding: 8px var(--gutter) 10px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  line-height: 1;
}

.brand-mark {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 26px;
}

.brand-lamp {
  display: block;
  width: 5px;
  height: 100%;
  border-radius: 3px;
  background: var(--signal-cyan);
}

.brand-lamp:nth-child(2) { height: 64%; background: var(--signal-orange); }

.brand-lamp:nth-child(3) { height: 84%; background: var(--mist); opacity: 0.5; }

.brand-text { display: flex; flex-direction: column; gap: 4px; }

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.brand-sub {
  font-family: var(--font-index);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.32em;
  color: var(--steel);
}

/* 主导航 */
.primary-nav { margin-inline: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.4vw, 24px);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 4px;
  font-size: 14.5px;
  letter-spacing: 0.06em;
  color: var(--ink-70);
  transition: color var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: var(--signal-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--mist); }

.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--signal-cyan); }

.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-foot { display: none; }

/* 右侧工具 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  margin-left: auto;
}

.version-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
  white-space: nowrap;
}

.version-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal-cyan);
  box-shadow: 0 0 8px rgba(55, 245, 212, 0.9);
}

.version-num { color: var(--mist); font-weight: 600; }

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--mist);
  transition: border-color var(--ease), color var(--ease), background var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible { border-color: var(--signal-cyan); color: var(--signal-cyan); }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle-bars i {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle-label {
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.site-header[data-open="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }

.site-header[data-open="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }

.site-header[data-open="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 阅读进度光带 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--signal-cyan), var(--signal-orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 120ms linear;
  pointer-events: none;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  color: var(--mist);
  background: linear-gradient(180deg, rgba(11, 43, 69, 0.62) 0%, rgba(6, 28, 47, 0.98) 78%);
  border-top: 1px solid var(--line);
}

.footer-signalbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px var(--gutter);
  border-bottom: 1px solid rgba(127, 162, 178, 0.14);
  overflow: hidden;
}

.signal-lamp {
  flex: 0 0 auto;
  width: 28px;
  height: 4px;
  border-radius: 2px;
  background: rgba(127, 162, 178, 0.24);
}

.signal-lamp.is-cyan {
  background: var(--signal-cyan);
  box-shadow: 0 0 12px rgba(55, 245, 212, 0.55);
}

.signal-lamp.is-orange {
  background: var(--signal-orange);
  box-shadow: 0 0 12px rgba(255, 122, 47, 0.45);
}

.footer-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(30px, 5vw, 62px) var(--gutter) 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(230px, 1.05fr) minmax(0, 2.1fr);
  gap: clamp(24px, 4vw, 64px);
}

.footer-brand .brand--footer { gap: 10px; }

.brand--footer .brand-mark { height: 22px; }

.brand--footer .brand-name { font-size: 17px; }

.brand--footer .brand-sub { font-size: 9px; letter-spacing: 0.28em; }

.footer-tagline {
  max-width: 34ch;
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-50);
}

.footer-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 32px);
}

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-index);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}

.footer-list { display: grid; gap: 10px; }

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--ink-70);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible { color: var(--signal-cyan); border-bottom-color: rgba(55, 245, 212, 0.5); }

.footer-contact {
  display: grid;
  gap: 10px;
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px dashed rgba(127, 162, 178, 0.22);
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.contact-label {
  min-width: 76px;
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.contact-value {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: var(--mist);
  word-break: break-all;
}

.contact-value--plain {
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.01em;
}

.copy-btn {
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-50);
  transition: color var(--ease), border-color var(--ease);
}

.copy-btn:hover,
.copy-btn:focus-visible { color: var(--signal-cyan); border-color: var(--signal-cyan); }

.footer-note {
  max-width: 72ch;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.9;
  color: var(--ink-50);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 20px;
  border-top: 1px solid rgba(127, 162, 178, 0.16);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  font-size: 12.5px;
  color: var(--ink-50);
}

.footer-copy,
.footer-icp { font-family: var(--font-mono); letter-spacing: 0.02em; }

.legal-sep { color: rgba(127, 162, 178, 0.5); }

.legal-link {
  color: var(--ink-70);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.legal-link:hover,
.legal-link:focus-visible { color: var(--signal-cyan); border-bottom-color: currentColor; }

.footer-credit {
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb li { display: flex; align-items: center; gap: 8px; }

.breadcrumb li + li::before {
  content: "/";
  color: rgba(127, 162, 178, 0.45);
}

.breadcrumb a { color: var(--ink-70); transition: color var(--ease); }

.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--signal-cyan); }

.breadcrumb [aria-current="page"] { color: var(--mist); }

/* ---------- 长文容器 ---------- */
.prose {
  max-width: 72ch;
  font-size: 16.5px;
  line-height: 1.95;
  color: var(--ink-80);
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.prose h3 {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--mist);
}

.prose a {
  color: var(--signal-cyan);
  border-bottom: 1px solid rgba(55, 245, 212, 0.4);
  transition: border-color var(--ease);
}

.prose a:hover { border-bottom-color: var(--signal-cyan); }

.prose strong { color: var(--mist); font-weight: 700; }

.prose ul { display: grid; gap: 0.5em; }

.prose ul li { position: relative; padding-left: 1.4em; }

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 9px;
  height: 2px;
  background: var(--signal-cyan);
}

.prose blockquote {
  padding-left: 1.2em;
  border-left: 2px solid var(--signal-orange);
  color: var(--ink-70);
}

/* ---------- 有机色块容器 ---------- */
.panel {
  padding: clamp(20px, 3vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(11, 43, 69, 0.72);
}

.panel--indigo {
  border-color: rgba(55, 245, 212, 0.14);
  background: linear-gradient(150deg, rgba(43, 27, 74, 0.92), rgba(11, 43, 69, 0.6));
}

.panel--wine {
  border-color: rgba(255, 122, 47, 0.22);
  background: linear-gradient(150deg, rgba(90, 31, 51, 0.88), rgba(6, 28, 47, 0.72));
}

/* ---------- 图片容器（页面阶段放置占位） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  background-image:
    linear-gradient(140deg, var(--night-blue) 0%, var(--indigo) 56%, var(--wine) 100%);
  background-size: cover;
  background-position: center;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 28, 47, 0.04), rgba(6, 28, 47, 0.58));
  pointer-events: none;
}

.media-frame > img,
.media-frame > picture,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--blob {
  border-radius: 48% 52% 44% 56% / 46% 44% 56% 54%;
}

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: rgba(11, 43, 69, 0.94);
  color: var(--mist);
  font-family: var(--font-index);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--ease), transform var(--ease), visibility var(--ease), color var(--ease), border-color var(--ease);
}

.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }

.to-top:hover,
.to-top:focus-visible { color: var(--signal-cyan); border-color: var(--signal-cyan); }

/* ---------- 响应式：平板 ---------- */
@media (max-width: 1080px) {
  .header-cta { display: none; }

  .nav-link { font-size: 14px; letter-spacing: 0.04em; }

  .footer-top { grid-template-columns: 1fr; }
}

/* ---------- 响应式：移动导航 ---------- */
@media (max-width: 960px) {
  :root { --header-h: 74px; }

  .header-inner { padding: 8px var(--gutter) 10px; }

  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: fixed;
    top: calc(var(--header-h) + 6px);
    left: var(--gutter);
    right: var(--gutter);
    display: block;
    margin: 0;
    padding: 14px;
    max-height: calc(100vh - var(--header-h) - 40px);
    overflow-y: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: rgba(11, 43, 69, 0.98);
    box-shadow: 0 30px 60px -34px rgba(0, 0, 0, 0.95);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--ease), transform var(--ease), visibility var(--ease);
  }

  .site-header[data-open="true"] .primary-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: block;
    padding: 12px 12px;
    border-radius: 12px;
    font-size: 15px;
  }

  .nav-link::after { display: none; }

  .nav-link:hover,
  .nav-link:focus-visible {
    color: var(--signal-cyan);
    background: rgba(55, 245, 212, 0.08);
  }

  .nav-link[aria-current="page"] { background: rgba(55, 245, 212, 0.1); }

  .nav-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 10px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.1em;
  }

  .nav-foot-label { color: var(--steel); }

  .nav-foot-value { color: var(--signal-cyan); }

  .col-4, .col-6, .col-7, .col-8 { grid-column: 1 / -1; }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* ---------- 响应式：手机 ---------- */
@media (max-width: 720px) {
  body { font-size: 15.5px; background-attachment: scroll; }

  .version-chip { display: none; }

  .brand-name { font-size: 17px; }

  .brand-sub { letter-spacing: 0.24em; }

  .signal-strip { gap: 5px; }

  .strip-tick { width: 22px; }

  .footer-nav-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .contact-label { min-width: 100%; }
}

@media (max-width: 460px) {
  .brand-sub { display: none; }

  .footer-nav-grid { grid-template-columns: 1fr; }

  .nav-toggle-label { display: none; }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .scroll-progress { transition: none; }

  html { scroll-behavior: auto; }
}